<clickhouse>
    <profiles>
        <default>
            <custom_a>Int64_-5</custom_a>
            <custom_b>UInt64_10000000000</custom_b>
            <custom_c>Float64_-43.25e-1</custom_c>
            <custom_d>'some text'</custom_d>
        </default>
    </profiles>
</clickhouse>
